Process and apparatus for deodorizing gases



May 4, 1937.

H. S. COLBY l' AL PROCESS AND APPARATUS FOR DEODORIZING GASES Original Filed June 14, 1934 Patented Mey 4, 1937 2,078,925

PROCESS AND APPARATUS FOR DEODORIZING GASES Haldwell S. Colby, Port Washington, N. Y., and Richard F. OMara, Chicago, Ill., assignors to Raymond Bros. Impact Pulverizer Co., Chicago,

Original application June 14, 1934, Serial No.

730,582. Divided and this application September 12, 1935, Serial No. 40,236

6 Claims. (Cl. 183-6) The present application is a division of applitogether with a portion of the air carrying it, cation No. 730,582, filed by the present appliconducted by means of pipe I8 to the burner cants on. June 14, 1934, (since issued as U. S. I9 of a second furnace 20. The purpose and Patent No. 2,032,402, on March 5, 1936). benefit of this second furnace is more fully ex- In said parent application there is described plained in the parent application. Its main 5 and claimed a system for disposing of so-called function is to burn odors out of the gases leavsewage sludge, such system including a seconding the SeDaratOr 9 before they are discharged ary furnace to which gases are carried to have to atmosphere. They are forced through duct burned out of them objectionable odors acquired 2|@ and into the second furnace 20 by means of 10 during the general process. The method of, and the fari 2|y Passing 0h their Way through the gaS 10 apparatus for, burning out the odors forms the heater l5 in which they become heated. Only subject matter of the present application. Obenoueh fuel is carried into the furnace 20 by viously the source of the gases with the objection- IrleahS 0f pipe I3 t0 burn out the OdOrS from able malodorous constituents is immaterial as far the gaSeS delivered thIOllgh dllCt 2 la The Predas the present invention is concerned. It will UCtS 0f Combustion leave the furnace 20 by the 15 however be of some advantage to describe briefiy duet 22 and give up their heat 0r as much as the entire system and this wm therefore be done. is practically feasible to the air entering the The single figure of the accompanying drawal Dreheater 4 by the duet I2- This air, S0 ing illustrates such a. system including our prespreheated, OWS through the gas preheater I5 to ent invention, give up some of its heat there, a small part be- 20 In the drawing the main furnace in which the ine diverted, if desired, t0 fiOW through duct 23 dried pulverized sludge is to be burned is desigt0 the furnace 2U t0 aCt aS Secondary Combusnated by the reference numeral I. The sludge tion air. It is the portion 0f this System last deundergoes a rst drying and pulverizing in the scribed and involving the furnace 20 and the drying tower 2 and mill 3, being fed into the gas Dreheater I5 and air preheater I4 with which 25 former from the mixer 4. This mixer receives the present application is specifically concerned.

the raw sludge at 5, and, in accordance with The important features of this part of the system existing practice, mixes it with a. certain amount are means to preheat the gases out of which of previously dried sludge which is returned and the odors are to be burned preferably to a temfed to the mixer by conveyor 6. The drying perature as near as possible to the temperature 30 tower 2 receives hot gases of combustion from oi' furnace 20, means to sustain the temperature the furnace by means of the duct 'I. The curin the furnace at a point sufficiently high to rent of hot gases leaves the mill 3 and is forced burn out the odors, and means to absorb heat by the fari 3a thrOllgh duet 8, Carrying ,With it from the gases leaving the furnace for use in the ground sludge into the collector-separator 9, preneating the gases. 35 Which discharges the dried material t0 the C011- It will be obvious that this is of rather general veyor bex 6a. From here a portion is returned application and tnat the particular use made of l to'mxel 4i as mentioned above the remainder this idea in the system described is only one posbemg fed t0 the Second mm Hiby means Qf sible application. The fuel, for example, used in 40 the SCTEW-C0Y1V9Y91' In and the Pme ma- Thls the furnace might obviously be something entire- 40 Second 1.11111 grmds and dnes the Sludge fur' 1y different than that used here and described ther uns bemg done m the presence of fresh herein. Moreover, the heat transfer from the air taken from the atmosphere at I2 and del f uvered to the mi11 by duct la after passing gases eavmg the mace mght be effected m through the air heater I4 and the gas heater lefy lgnkynssdment rotnl those shown 45 I5. In the former of these the air is heated to pec1-c torm 11 ustr-a'ted 31nd a high degree by means more fully referred to described this heat transfer 1s accomplished 1nbelow and in the second it again gives up part dlrectiy by fresh au" absorbtng the heat lOm the of its heat. The heated air carries sludge from Outgomg gajses and dehvermg 1t 01 a Part 0f 1t so mill Il by means of duct I6 to the furnace l, t0 the lngeine eases, the transfer might be acthe air Serving s primary Combustion air. Sec.. compllshed diletly from the Outgoing gases to ondary combustion air for the furnace l is taken the ngong gaSeS- We therefore d0 rlOt WiSh t0 off duct i3 and carried to the furnaceby duct I1. be limited to the Specific form herein disclosed Some of the sludge which has undergone adbut Wish to have the invention protected to us ditional grinding and drying in the mill II is, Within the scope of the appended claims. 55

What we claim is:

1. In apparatus resulting in gases charged with malodorous constituents of a nature such that these bad odors can be destroyed by raising the temperature of the gases to a certain point, the combination of a chamber separate from that in which the gases originate, a duct to carry the gases from their point of generation to the chamber, means to introduce into the chamber and then to burn a combustible in addition to any that may be present in the gases to raise the temperature to said point, a duct to carry the gases and the products of combustion from the chamber to the atmosphere, and means to transfer heat from the gases and products of combustion passing through said last named duct to the gases passing through the first named duct.

2. Apparatus `for treating gases charged with malodorous constituents of a nature such that these bad odors can be destroyed by raising the temperature of the gases to a certain point, comprising a chamber separate from that in which the gases originate, means to convey the gases from their point of generation to the chamber, means to convey them from the chamber to the atmosphere, means to abstract heat from gases flowing from the chamber and to deliver it to gases on their way to the chamber, and means to burn combustible other than that which may be present in the gases enough to develop suflicient heat to destroy the odors if added to the gases in the chamber and to deliver the heat so developed to the gases in the chamber.

3. The process of burning out of gases odors caused by constituents of a nature such that these odors can be destroyed by raising the ternperature of the gases to a certain point comprislng conducting the gases to a chamber other than that where they originated, conducting them from the chamber to the atmosphere, absorbing heat from them after they leave the chamber and delivering it to gases on their Way to the chamber, and raising the temperature of the gases in the chamber to the required point by adding further heat from a source other than the gases themselves.

4. The process of burning out of gases odors causxi by constituents of a nature such that these odors can be destroyed by raising the temperature of the gases to a certain point comprising conducting the gases to a chamber other than that where. they originated, conducting them from the chamber to the atmosphere, absorbing heat from them after they leave the chamber and delivering it to gases on their way to the chamber, and burning in the chamber suiicient combustible other than any that may be present in the gases to raiseV the temperature of the gases to the required point.

5. In apparatus resulting in gases charged with malodorous constituents of a nature such that these bad odors can be destroyed by raising the temperature of the gases to a certain point, the combination of a chamber separate from that in which the gases originate, a duct to carry the gases from their point of generation to the chamber, means to introduce into the chamber and there to burn a combustible in addition to any that may be present in the gases to raise the temperature to said point, a duct to carry the gases and the products of combustion from the chamber to the atmosphere, means to heat air by the products of combustion, means to transfer a part of the heat from the air to the gases flowing to- Ward the chamber, and means to deliver other heat from the air directly to the chamber.

6. In apparatus resulting in gases charged with malodorous constituents of a nature such that these bad odors can be destroyed by raising the temperature of the gases to a certain point, the combination of a chamber separate from that in which the gases originate, a duct to carry the gases from their point of generation to the chamber, means to introduce into the chamber and there to burn a combustible in addition to any that may be present in the gases to raise the temperature to said point, a duct to carry the gases and the products of combustion from the chamber to the atmosphere, means to heat air by the products of combustion, means to transfer heat from a part of the air to the gases flowing toward the chamber, and means to deliver part of the air to the chamber.

HALDWELL S. COLBY. RICHARD F. OMARA. 

